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  Spring Web工具类
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  <p>继承WebUtils类 </p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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lombok.experimental.UtilityClass;</span><br><span class="line">import lombok.extern.slf4j.Slf4j;</span><br><span class="line">import org.springframework.web.bind.annotation.ResponseBody;</span><br><span class="line">import org.springframework.web.context.request.RequestContextHolder;</span><br><span class="line">import org.springframework.web.context.request.ServletRequestAttributes;</span><br><span class="line">import org.springframework.web.method.HandlerMethod;</span><br><span class="line"></span><br><span class="line">import java.util.Optional;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * Miscellaneous utilities for web applications.</span><br><span class="line"> *</span><br><span class="line"> * @author </span><br><span class="line"> */</span><br><span class="line">@Slf4j</span><br><span class="line">@UtilityClass</span><br><span class="line">public class WebUtils extends org.springframework.web.util.WebUtils &#123;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 判断是否ajax请求 spring ajax 返回含有 ResponseBody 或者 RestController注解</span><br><span class="line">	 * @param handlerMethod HandlerMethod</span><br><span class="line">	 * @return 是否ajax请求</span><br><span class="line">	 */</span><br><span class="line">	public boolean isBody(HandlerMethod handlerMethod) &#123;</span><br><span class="line">		ResponseBody responseBody = ClassUtils.getAnnotation(handlerMethod, ResponseBody.class);</span><br><span class="line">		return responseBody != null;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 读取cookie</span><br><span class="line">	 * @param name cookie name</span><br><span class="line">	 * @return cookie value</span><br><span class="line">	 */</span><br><span class="line">	public String getCookieVal(String name) &#123;</span><br><span class="line">		if (WebUtils.getRequest().isPresent()) &#123;</span><br><span class="line">			return getCookieVal(WebUtils.getRequest().get(), name);</span><br><span class="line">		&#125;</span><br><span class="line">		return null;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 读取cookie</span><br><span class="line">	 * @param request HttpServletRequest</span><br><span class="line">	 * @param name cookie name</span><br><span class="line">	 * @return cookie value</span><br><span class="line">	 */</span><br><span class="line">	public String getCookieVal(HttpServletRequest request, String name) &#123;</span><br><span class="line">		Cookie cookie = getCookie(request, name);</span><br><span class="line">		return cookie != null ? cookie.getValue() : null;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 清除 某个指定的cookie</span><br><span class="line">	 * @param response HttpServletResponse</span><br><span class="line">	 * @param key cookie key</span><br><span class="line">	 */</span><br><span class="line">	public void removeCookie(HttpServletResponse response, String key) &#123;</span><br><span class="line">		setCookie(response, key, null, 0);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 设置cookie</span><br><span class="line">	 * @param response HttpServletResponse</span><br><span class="line">	 * @param name cookie name</span><br><span class="line">	 * @param value cookie value</span><br><span class="line">	 * @param maxAgeInSeconds maxage</span><br><span class="line">	 */</span><br><span class="line">	public void setCookie(HttpServletResponse response, String name, String value, int maxAgeInSeconds) &#123;</span><br><span class="line">		Cookie cookie = new Cookie(name, value);</span><br><span class="line">		cookie.setPath(&quot;/&quot;);</span><br><span class="line">		cookie.setMaxAge(maxAgeInSeconds);</span><br><span class="line">		cookie.setHttpOnly(true);</span><br><span class="line">		response.addCookie(cookie);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 获取 HttpServletRequest</span><br><span class="line">	 * @return &#123;HttpServletRequest&#125;</span><br><span class="line">	 */</span><br><span class="line">	public Optional&lt;HttpServletRequest&gt; getRequest() &#123;</span><br><span class="line">		return Optional</span><br><span class="line">			.ofNullable(((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest());</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	public HttpServletRequest getRequestOrElseThrow() &#123;</span><br><span class="line">		return WebUtils.getRequest().orElseThrow(() -&gt; new BusinessException(BusinessErrorEnum.SYSTEM_ERROR));</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 获取 HttpServletResponse</span><br><span class="line">	 * @return &#123;HttpServletResponse&#125;</span><br><span class="line">	 */</span><br><span class="line">	public HttpServletResponse getResponse() &#123;</span><br><span class="line">		return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>类工具类</p>
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constructor, int parameterIndex) &#123;</span><br><span class="line">		MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);</span><br><span class="line">		methodParameter.initParameterNameDiscovery(PARAMETERNAMEDISCOVERER);</span><br><span class="line">		return methodParameter;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 获取方法参数信息</span><br><span class="line">	 * @param method 方法</span><br><span class="line">	 * @param parameterIndex 参数序号</span><br><span class="line">	 * @return &#123;MethodParameter&#125;</span><br><span class="line">	 */</span><br><span class="line">	public MethodParameter getMethodParameter(Method method, int parameterIndex) &#123;</span><br><span class="line">		MethodParameter methodParameter = new SynthesizingMethodParameter(method, parameterIndex);</span><br><span class="line">		methodParameter.initParameterNameDiscovery(PARAMETERNAMEDISCOVERER);</span><br><span class="line">		return methodParameter;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 获取Annotation</span><br><span class="line">	 * @param method Method</span><br><span class="line">	 * @param annotationType 注解类</span><br><span class="line">	 * @param &lt;A&gt; 泛型标记</span><br><span class="line">	 * @return &#123;Annotation&#125;</span><br><span class="line">	 */</span><br><span class="line">	public &lt;A extends Annotation&gt; A getAnnotation(Method method, Class&lt;A&gt; annotationType) &#123;</span><br><span class="line">		Class&lt;?&gt; targetClass = method.getDeclaringClass();</span><br><span class="line">		// The method may be on an interface, but we need attributes from the target</span><br><span class="line">		// class.</span><br><span class="line">		// If the target class is null, the method will be unchanged.</span><br><span class="line">		Method specificMethod = ClassUtils.getMostSpecificMethod(method, targetClass);</span><br><span class="line">		// If we are dealing with method with generic parameters, find the original</span><br><span class="line">		// method.</span><br><span class="line">		specificMethod = BridgeMethodResolver.findBridgedMethod(specificMethod);</span><br><span class="line">		// 先找方法，再找方法上的类</span><br><span class="line">		A annotation = AnnotatedElementUtils.findMergedAnnotation(specificMethod, annotationType);</span><br><span class="line">		;</span><br><span class="line">		if (null != annotation) &#123;</span><br><span class="line">			return annotation;</span><br><span class="line">		&#125;</span><br><span class="line">		// 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类</span><br><span class="line">		return AnnotatedElementUtils.findMergedAnnotation(specificMethod.getDeclaringClass(), annotationType);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 获取Annotation</span><br><span class="line">	 * @param handlerMethod HandlerMethod</span><br><span class="line">	 * @param annotationType 注解类</span><br><span class="line">	 * @param &lt;A&gt; 泛型标记</span><br><span class="line">	 * @return &#123;Annotation&#125;</span><br><span class="line">	 */</span><br><span class="line">	public &lt;A extends Annotation&gt; A getAnnotation(HandlerMethod handlerMethod, Class&lt;A&gt; annotationType) &#123;</span><br><span class="line">		// 先找方法，再找方法上的类</span><br><span class="line">		A annotation = handlerMethod.getMethodAnnotation(annotationType);</span><br><span class="line">		if (null != annotation) &#123;</span><br><span class="line">			return annotation;</span><br><span class="line">		&#125;</span><br><span class="line">		// 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类</span><br><span class="line">		Class&lt;?&gt; beanType = handlerMethod.getBeanType();</span><br><span class="line">		return AnnotatedElementUtils.findMergedAnnotation(beanType, annotationType);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>Spring 上下文工具类</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br></pre></td><td class="code"><pre><span class="line">package com.xoao.sms.common.utils;</span><br><span class="line"></span><br><span class="line">import lombok.SneakyThrows;</span><br><span class="line">import lombok.extern.slf4j.Slf4j;</span><br><span class="line">import org.springframework.beans.factory.DisposableBean;</span><br><span class="line">import org.springframework.context.ApplicationContext;</span><br><span class="line">import org.springframework.context.ApplicationContextAware;</span><br><span class="line">import org.springframework.context.ApplicationEvent;</span><br><span class="line">import org.springframework.context.annotation.Lazy;</span><br><span class="line">import org.springframework.stereotype.Service;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * @author </span><br><span class="line"> * @date 2019/2/1 Spring 工具类</span><br><span class="line"> */</span><br><span class="line">@Slf4j</span><br><span class="line">@Service</span><br><span class="line">@Lazy(false)</span><br><span class="line">public class SpringContextHolder implements ApplicationContextAware, DisposableBean &#123;</span><br><span class="line"></span><br><span class="line">	private static ApplicationContext applicationContext = null;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 取得存储在静态变量中的ApplicationContext.</span><br><span class="line">	 */</span><br><span class="line">	public static ApplicationContext getApplicationContext() &#123;</span><br><span class="line">		return applicationContext;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 实现ApplicationContextAware接口, 注入Context到静态变量中.</span><br><span class="line">	 */</span><br><span class="line">	@Override</span><br><span class="line">	public void setApplicationContext(ApplicationContext applicationContext) &#123;</span><br><span class="line">		SpringContextHolder.applicationContext = applicationContext;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.</span><br><span class="line">	 */</span><br><span class="line">	@SuppressWarnings(&quot;unchecked&quot;)</span><br><span class="line">	public static &lt;T&gt; T getBean(String name) &#123;</span><br><span class="line">		return (T) applicationContext.getBean(name);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.</span><br><span class="line">	 */</span><br><span class="line">	public static &lt;T&gt; T getBean(Class&lt;T&gt; requiredType) &#123;</span><br><span class="line">		return applicationContext.getBean(requiredType);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 清除SpringContextHolder中的ApplicationContext为Null.</span><br><span class="line">	 */</span><br><span class="line">	public static void clearHolder() &#123;</span><br><span class="line">		if (log.isDebugEnabled()) &#123;</span><br><span class="line">			log.debug(&quot;清除SpringContextHolder中的ApplicationContext:&quot; + applicationContext);</span><br><span class="line">		&#125;</span><br><span class="line">		applicationContext = null;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 发布事件</span><br><span class="line">	 * @param event</span><br><span class="line">	 */</span><br><span class="line">	public static void publishEvent(ApplicationEvent event) &#123;</span><br><span class="line">		if (applicationContext == null) &#123;</span><br><span class="line">			return;</span><br><span class="line">		&#125;</span><br><span class="line">		applicationContext.publishEvent(event);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 实现DisposableBean接口, 在Context关闭时清理静态变量.</span><br><span class="line">	 */</span><br><span class="line">	@Override</span><br><span class="line">	@SneakyThrows</span><br><span class="line">	public void destroy() &#123;</span><br><span class="line">		SpringContextHolder.clearHolder();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>具体使用</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">HttpServletResponse response = WebUtils.getResponse();</span><br><span class="line">        response.setStatus(HttpStatus.HTTP_OK);</span><br><span class="line">        response.setContentType(ContentType.OCTET_STREAM.toString());</span><br><span class="line">        response.setHeader(HeaderName.CONTENT_DISPOSITION.getValue(), CharSequenceUtil</span><br><span class="line">                .format(&quot;attachment;filename=\&quot;&#123;&#125;.txt\&quot;&quot;, new String(fileName.getBytes(), StandardCharsets.ISO_8859_1)));</span><br><span class="line">        // 读取文件并写入响应输出流，IoUtil是hutool工具包下的类</span><br><span class="line">        IoUtil.write(response.getOutputStream(), content.getBytes());</span><br></pre></td></tr></table></figure>

 
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